2021-11-13 14:32:00 -05:00
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; write to stdout
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2021-11-13 17:24:45 -05:00
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B=:hello_world
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call :puts
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J=d0
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2021-11-12 22:00:46 -05:00
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syscall x3c
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2021-11-13 13:00:35 -05:00
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2021-11-13 13:48:27 -05:00
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:hello_world
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2021-11-13 13:56:26 -05:00
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str Hello, world!
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2021-11-13 13:48:27 -05:00
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xa
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2021-11-13 17:24:45 -05:00
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x0
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; output null-terminated string in rbx
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:puts
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call :strlen
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I=D
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D=A
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J=d1
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syscall d1
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return
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; calculate length of string in rbx
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; keeps pointer to start of string in rdx, end of string in rsi
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:strlen
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; keep pointer to start of string
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D=B
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I=B
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:strlen_loop
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C=1I
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?C=0:strlen_loop_end
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I+=d1
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!:strlen_loop
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:strlen_loop_end
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I-=D
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A=I
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return
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